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$ cat test3.pl
#!/usr/bin/perl
...
First: 1, Second: , Third: , Fourth: .
First: 2, Second: 3, Third: 4, Fourth: .
First: 5, Second: 6, Third: 7 8 9 0, Fourth: .

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$ cat test4.pl
#!/usr/bin/perl
...
Arg: FOOBAR.
Arg: BARBAZ.
T1: foobar, T2: BARBAZ.